Geoderma · 2012 · 59 citations · 59 references
59
Methods of soil analysis. Part 3 - chemical methods.
Donald L. Sparks, A. L. Page, Philip A. Helmke et al. · 1996 · 8.6K citations
Ferrozine---a new spectrophotometric reagent for iron
Lawrence L. Stookey · Analytical Chemistry · 1970 · 4.7K citations